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  • 1.
    Birk, Wolfgang
    et al.
    Luleå University of Technology, Department of Computer Science, Electrical and Space Engineering, Signals and Systems.
    Eliasson, Jens
    Luleå University of Technology, Department of Computer Science, Electrical and Space Engineering, Embedded Internet Systems Lab.
    Lindgren, Per
    Luleå University of Technology, Department of Computer Science, Electrical and Space Engineering, Embedded Internet Systems Lab.
    Osipov, Evgeny
    Luleå University of Technology, Department of Computer Science, Electrical and Space Engineering, Computer Science.
    Riliskis, Laurynas
    Luleå University of Technology, Department of Computer Science, Electrical and Space Engineering, Computer Science.
    Road surface networks technology enablers for enhanced ITS2010In: 2010 IEEE Vehicular Networking Conference, VNC 2010: Jersey City, NJ ; 13-15 Dec 2010, Piscataway, NJ: IEEE Communications Society, 2010, p. 152-159Conference paper (Refereed)
    Abstract [en]

    The increased need for mobility has led to transportation problems like congestion, accidents and pollution. In order to provide safe and efficient transport systems great efforts are currently being put into developing Intelligent Transport Systems (ITS) and cooperative systems. In this paper we extend proposed solutions with autonomous on-road sensors and actuators forming a wireless Road Surface Network (RSN). We present the RSN architecture and design methodology and demonstrate its applicability to queue-end detection. For the use case we discuss the requirements and technological solutions to sensor technology, data processing and communication. In particular the MAC protocol is detailed and its performance assessed through theoretical verification. The RSN architecture is shown to offer a scalable solution, where increased node density offers more precise sensing as well as increased redundancy for safety critical applications. The use-case demonstrates that RSN solutions may be deployed as standalone systems potentially integrated into current and future ITS. RSN may provide both easily deployable and cost effective alternatives to traditional ITS (with a direct impact independent of penetration rate of other ITS infrastructures - i.e., smart vehicles, safe spots etc.) as well as provide fine grain sensory information directly from the road surface to back-end and cooperative systems, thus enabling a wide range of ITS applications beyond current state of the art.

  • 2.
    Birk, Wolfgang
    et al.
    Luleå University of Technology, Department of Computer Science, Electrical and Space Engineering, Signals and Systems.
    Osipov, Evgeny
    Luleå University of Technology, Department of Computer Science, Electrical and Space Engineering, Computer Science.
    Riliskis, Laurynas
    Luleå University of Technology, Department of Computer Science, Electrical and Space Engineering, Computer Science.
    Hesler, Alban
    NEC.
    Modular design and performance ranking of communication protocols2009Report (Other academic)
    Abstract [en]

    In this deliverable we present a systematic approach towards designing modularized protocols and rank a contribution of their components to the overall system performance. In the nutshell, this approach is based onthree steps: 1.) identifying adjustable parameters in existing protocols, 2.) ranking their influence on the system-level performance metrics and 3.) defining protocol modules exposing the parameters of the highest rank. To this end we present the definition of the components for constructing MAC protocols based on ranking of the impact of adjustable parameters on the overall system performance. We also overview a ranking method for functional blocks of protocols on the routing layer.

  • 3.
    Buttyan, Levente
    et al.
    BME.
    Acs, Gergely
    BME.
    Schaffer, Peter
    BME.
    Farkas, Karoly
    BME.
    Bencsath, Boldizsar
    BME.
    Thong, Ta Vinh
    BME.
    Laszka, Aron
    BME.
    Grilo, Antonio
    INOV.
    Hessler, Alban
    NEC.
    Riliskis, Laurynas
    Luleå University of Technology, Department of Computer Science, Electrical and Space Engineering, Computer Science.
    Osipov, Evgeny
    Luleå University of Technology, Department of Computer Science, Electrical and Space Engineering, Computer Science.
    Perito, Daniele
    INRIA.
    Castelluccia, Claude
    INRIA.
    Dependability concepts, models, and analysis of networking mechanisms for WSANs2009Report (Other academic)
    Abstract [en]

    In this deliverable, we report on the results of Work Package 3 (Dependable Networking) obtained in the first year of the WSAN4CIP Project. These results are related to the identification of the design principles of dependable networking mechanisms for WSANs. In our work, and hence, in this deliverable, we follow the layered model of networking protocol stacks: We identify the most important dependability concepts and models at the physical, MAC (Medium Access Control), routing, and transport layers, and we analyze existing networking protocols from the different layers proposed in the literature with respect to the identified dependability properties.

  • 4.
    Dai, William
    et al.
    Luleå University of Technology, Department of Computer Science, Electrical and Space Engineering, Computer Science.
    Riliskis, Laurynas
    Vyatkin, Valeriy
    Luleå University of Technology, Department of Computer Science, Electrical and Space Engineering, Computer Science.
    Osipov, Evgeny
    Luleå University of Technology, Department of Computer Science, Electrical and Space Engineering, Computer Science.
    Delsing, Jerker
    Luleå University of Technology, Department of Computer Science, Electrical and Space Engineering, Embedded Internet Systems Lab.
    A Configurable Cloud-Based Testing Infrastructure for Interoperable Distributed Automation Systems2015In: IECON 2014: 40th Annual Conference of the IEEE Industrial Electronics Society, Dallas, TX, USA , Oct. 29 2014-Nov. 1 2014, Piscataway, NJ: IEEE Communications Society, 2015, p. 2492-2498Conference paper (Refereed)
    Abstract [en]

    The interoperability between various automation systems is considered as one of the major character of future automation systems. Service-oriented Architecture is a possible interoperability enabler between legacy and future automation systems. In order to prove the interoperability between those systems, a verification framework is essential. This paper proposes a configurable cloud-based validation environment for interoperability tests between various distributed automation systems. The testing framework is implemented in a multi-layer structure which provides automated closed-loop testing from the protocol level to the system level. The testing infrastructure is also capable for simulating automation systems as well as wireless sensor networks in the cloud. Test cases could be automatically generated and executed by the framework.

  • 5.
    Eldstål-Damlin, Albin
    et al.
    Luleå tekniska universitet.
    Riliskis, Laurynas
    Luleå University of Technology, Department of Computer Science, Electrical and Space Engineering, Computer Science.
    A comparison of two modes for AEAD services in wireless sensor networks2011Conference paper (Other academic)
    Abstract [en]

    In the context of resource-limited sensor motes, security is often discarded or compromised upon. This report presents tests on SCM and CCM, two modes of operation for ensuring confidentiality and authenticity of messages passed between nodes in a wireless sensor network. The modes are compared with regards to time complexity and energy efficiency when run on the iRoad Mulle. We show that SCM is both faster and more energy efficient than CCM, as well as more suited for multi-hop routing topologies.

  • 6.
    Fan, Zheng
    et al.
    Department of Logistics Engineering, Wuhan University of Technology.
    Li, Wenfang
    Department of Logistics Engineering, Wuhan University of Technology.
    Eliasson, Jens
    Luleå University of Technology, Department of Computer Science, Electrical and Space Engineering, Embedded Internet Systems Lab.
    Riliskis, Laurynas
    Luleå University of Technology, Department of Computer Science, Electrical and Space Engineering, Computer Science.
    Mäkitaavola, Henrik
    Luleå University of Technology, Department of Computer Science, Electrical and Space Engineering, Embedded Internet Systems Lab.
    TinyMulle: a low-power platform for demanding WSN applications2010In: 6th International Conference on Wireless Communications, Networking and Mobile Computing: WiCOM '10, 23 - 25 Sept. 2010, Chengdu, China ; proceedings, Piscataway, NJ: IEEE Communications Society, 2010Conference paper (Refereed)
    Abstract [en]

    The research area of Wireless Sensor Networks (WSN) is growing rapidly. WSN technology is making entrance into new application areas, for example industrial control and Critical Infrastructure (CI) environments. Energy efficiency is a highly prioritized goal of communication protocols and application design for WSN. However, the usage of WSN in both industrial and CI environments are starting to require more and more complex applications. In this paper, we present a new low-power wireless sensor platform nicknamed TinyMulle. The TinyMulle architecture consists of a 16-bit micro controller with a maximum speed of 20 MHz and 31kB of RAM, an IEEE 802.15.4 compatible radio transceiver and several on-board sensors. Even with its small physical size, it is a powerful node capable of meeting the ever more demanding requirements of today's applications. Power consumption experiments indicate that operational lifetimes for TinyMulle in the range of months to years is feasible. The support for TinyOS enables the new platform to reuse existing software components developed for other sensor platforms

  • 7.
    Khattak, Rabiullah
    et al.
    Luleå tekniska universitet.
    Chaltseva, Anna
    Luleå University of Technology, Department of Computer Science, Electrical and Space Engineering, Computer Science.
    Riliskis, Laurynas
    Luleå University of Technology, Department of Computer Science, Electrical and Space Engineering, Computer Science.
    Bodin, Ulf
    Luleå University of Technology, Department of Computer Science, Electrical and Space Engineering, Computer Science.
    Osipov, Evgeny
    Luleå University of Technology, Department of Computer Science, Electrical and Space Engineering, Computer Science.
    Comparison of wireless network simulators with multihop wireless network testbed in corridor environment2011In: Wired/wireless internet communications: 9th IFIP TC 6 International Conference, WWIC 2011, Vilanova i la Geltrú, Spain, June 15-17, 2011 ; proceedings / [ed] Xavier Masip-Bruin, Berlin: Encyclopedia of Global Archaeology/Springer Verlag, 2011, p. 80-91Conference paper (Refereed)
    Abstract [en]

    This paper presents a comparative study between results of a single channel multihop wireless network testbed and the network simulators ns-2 and ns-3. We explore how well these simulators reflect reality with their standard empirical radio modeling capabilities. The environment studied is a corridor causing wave-guiding propagation phenomena of radio waves, which challenges the radio models used in the simulators. We find that simulations are roughly matching with testbed results for single flows, but clearly deviate from testbed results for concurrent flows. The mismatch between simulations and testbed results is due to imperfect wireless propagation channel modeling. This paper reveals the importance of validating simulation results when studying single channel multihop wireless network performance. It further emphasizes the need for validation when using empirical radio modeling for more complex environments such as corridors.

  • 8.
    Kleyko, Denis
    et al.
    Luleå University of Technology, Department of Computer Science, Electrical and Space Engineering, Computer Science.
    Lyamin, Nikita
    Siberian State University of Telecommunications and Information Sciences.
    Osipov, Evgeny
    Luleå University of Technology, Department of Computer Science, Electrical and Space Engineering, Computer Science.
    Riliskis, Laurynas
    Luleå University of Technology, Department of Computer Science, Electrical and Space Engineering, Computer Science.
    Dependable MAC layer architecture based on holographic data representation using hyper-dimensional binary spatter codes2012In: Multiple Access Communications: 5th International Workshop, MACOM 2012, Maynooth, Ireland, November 19-20, 2012. Proceedings / [ed] Boris Bellalta, Heidelberg: Encyclopedia of Global Archaeology/Springer Verlag, 2012, p. 134-145Conference paper (Refereed)
    Abstract [en]

    In this article we propose the usage of binary spatter codes and distributed data representation for communicating loss and delay sensitive data in event-driven sensor and actuator networks. Using the proposed data representation technique along with the medium access control protocol the mission critical control information can be transmitted with assured constant delay in deployments exposing below 0 dB signal-to-noise ratio figures.

  • 9.
    Nunes, Renato
    et al.
    INOV.
    Pereira, Paulo
    INOV.
    Peter, Steffen
    IHP.
    Piotrowski, Krzysztof
    IHP.
    Winkler, Rita
    IHP.
    Riliskis, Laurynas
    Luleå University of Technology, Department of Computer Science, Electrical and Space Engineering, Computer Science.
    Osipov, Evgeny
    Luleå University of Technology, Department of Computer Science, Electrical and Space Engineering, Computer Science.
    Tools and methods for systematic WSAN engineering2009Report (Other academic)
    Abstract [en]

    The goal of this deliverable is to research an application-centric communication system engineering framework that supports system engineers in analysing and defining requirements as well as providing tool support during the selection of particular network mechanisms to be used within the WSAN under development. For this purpose we present a general design flow to help engineering WSAN applications. The semantic centreis a knowledge base it allows to describe requirements, environment, components and the whole system. The presented model-driven scheme as part of the component description is able to predict the properties of theoverall system based on static properties of components in context of the given environment. For more complex dynamic properties a novel simulation approach is presented that combines network simulations with actual properties of the operating system and the software stack. Operations of the development flow are supported by various tools. First examples indicate the effectiveness of the proposed design flow and promiseto improve engineering of WSAN system in future.

  • 10.
    Osipov, Evgeny
    et al.
    Luleå University of Technology, Department of Computer Science, Electrical and Space Engineering, Computer Science.
    Birk, Wolfgang
    Luleå University of Technology, Department of Computer Science, Electrical and Space Engineering, Signals and Systems.
    Riliskis, Laurynas
    Project: EU FP7 project WSAN4CIP: Wireless Sensor and Actuator Networks for Critical Infrastructure Protection2008Other (Other (popular science, discussion, etc.))
    Abstract [en]

    The WSAN4CIP project focuses on the ICT theme and covers the Objective ICT-SEC-2007.1.7 of the joint call between the ICT Theme and the Security Theme on Critical Infrastructure Protection. The goal of this project is to increase the dependability of Wireless Sensor and Actuator Networks (WSANs) significantly beyond the current state of the art. By that WSAN will become a "technology building blocks for creating, monitoring and managing secure, resilient and always available information infrastructure. Wireless Sensor and Actuator Networks (WSAN) provide an ideal means to achieve the envisioned improvement on CI reliability. The highly distributed nature of WSAN boosts their ability to survive malicious attacks as well as accidental failures and makes them dependable in critical situations when the information is needed to prevent further damage to critical infrastructures. As WSANs are inexpensive to lay out and self-organizing, an emergency extension of the WSAN as a first reaction is possible. Exploiting these features makes WSANs an ideal mechanism to improve situation awareness of managing tools for critical infrastructures. But current state of the art WSANs are not sufficiently dependable. In order to remedy this we will tackle the following challenges: 1.      Improving sensor node protection to improve their dependability 2.      Investigation of dependable networking approaches 3.      Investigation of dependable services running on top of WSAN that ensure graceful degradation in case of failures. In order to allow an easy use of WSAN and to make them really a technology building block we will investigate and develop Methodologies for designing WSAN according to specific requirements and we will define an open interface to ensure interoperability with existing CI management applications. We will demonstrate the appropriateness of our approach by applying it to two representative CI applications, in the area of power generation and distribution management system.

  • 11.
    Osipov, Evgeny
    et al.
    Luleå University of Technology, Department of Computer Science, Electrical and Space Engineering, Computer Science.
    Riliskis, Laurynas
    Luleå University of Technology, Department of Computer Science, Electrical and Space Engineering, Computer Science.
    Educating Innovators of Future Internet of Things2013In: 2013 Frontiers in Education Conference (FIE 2013): Oklahoma City, Olöahoma, USA, 23-26 October 2013, Piscataway, NJ: IEEE Communications Society, 2013, p. 1352-1358Conference paper (Refereed)
    Abstract [en]

    Clouds, Communicating Machines, Social Networking, Big Data, innovative web-services are the buzz words that currently ramp up the interest in computer science education amongst potential students. The current trend in CS education is to introduce an innovation component into the content of undergraduate and graduate courses facilitating out of the box thinking. In the fall of 2012 the content of three undergraduate courses running in parallel at Luleå University of Technology were aligned in the theoretical and practical parts projecting the individual contents to a holistic scenario of the Internet of Things. The practical goal of the trial was to provide skills of developing innovative, cutting-edge IT solutions. The trial courses were: Wireless sensor networks, Distributed applications, and Network programming. The first two courses are given on the fourth year while the later course is given on the second year of the CS program. The theoretical content of three courses allowed creating a scenario covering the whole technology chain of the Internet of Things: gathering and communicating sensory data; scalable and distributed processing of big data; value-added, human relevant network services. In the practical part students in the three courses (total 60) acted as start-up companies in the respective technology domain. These ``start-ups'' were assigned a task to deliver a common holistic system given time, performance and budget constrains. This task required students in a particular course to constantly communicate to other students outside the course's boundaries. Through these activities students were trained on skills for industrial level development and integration of complex IT systems. On a technical side all courses were conducted using Amazon Web Services as a common computing platform. This choice allowed us to draw interesting conclusions about students work load, the degree of their actual involvement in the learning process as well as economical costs. In the sensor network course a pedagogy-oriented, close-to-reality, real-time simulation environment was used to substantially facilitate experimentation with large quantities of communicating sensors. Using AWS as a platform for the other two courses gave students a possibility of experimenting with hundreds of servers while training the skills in developing commercial scale software. As a result of evaluations in the respective courses we conjecture that the goal of the trial is successfully achieved. The innovative component was highly valued by the majority of students. Most of the students confirmed that exposing them to the ``big picture'' and product-based learning substantially increased their involvement and motivation in the learning process. On the technical side several non-conventional applications of the theoretical content were observed in all three courses. One of the successful resulting systems featured a unique integration of real-time sensory data with a popular social network. The full article will describe the details of the courses' structure along with the associated logistical and technical challenges. We present the illustrative achievements as well as the analysis of students' feedback. The article will be concluded with the discussion of learned positive and negative lessons put in the context of recent theories in CS education.

  • 12.
    Osipov, Evgeny
    et al.
    Luleå University of Technology, Department of Computer Science, Electrical and Space Engineering, Computer Science.
    Riliskis, Laurynas
    Luleå University of Technology, Department of Computer Science, Electrical and Space Engineering, Computer Science.
    On synthesis of dependable MAC protocol for two real-world WSN applications2011In: 2011 Baltic Congress on Future Internet Communications (BCFIC Riga), IEEE Communications Society, 2011, p. 41-49Conference paper (Refereed)
    Abstract [en]

    Currently, when matter comes to engineer a communication system for a new WSN application with a unique set of dependability requirements, the developer should undergo a lengthy process of analyzing the existing solutions in order to select appropriate functionality. In this article we argue that because of variety of wireless sensor network applications there is a clear need for a systematic approach to develop application-tailored communication solutions. The core of this methodology constitute functional components with known reliability and security properties and the rules of combining these components in a communication system. On the example of engineering MAC protocol for two real world applications, we demonstrate a line of dependable reasoning and identify components satisfying the dependability requirements of the application.

  • 13.
    Osipov, Evgeny
    et al.
    Luleå University of Technology, Department of Computer Science, Electrical and Space Engineering, Computer Science.
    Riliskis, Laurynas
    Luleå University of Technology, Department of Computer Science, Electrical and Space Engineering, Computer Science.
    Specification and analysis of dependable networking mechanisms for the WSAN4CIP application scenarios2010Report (Other academic)
    Abstract [en]

    This document presents the requirements analysis, specification and preliminary evaluation of the WSAN4CIP dependable protocol stack. The protocol stack considers the following four layers: Application, Transport, Routing and MAC. At the Transport layer, the Distributed Transport for Sensor Networks (DTSN) was selected to support reliable multimedia data transmission. At the Routing layer, the IPv6 Routing Protocol for Low power and Lossy Networks was selected due to its low overhead. At the MAC layer, a multichannel TDMA protocol was selected.Protocol evaluation is based on a mix of analytical studies and computer simulation. The results show that the specified protocols are compliant with the requirements of the EDP and FWA demonstrators defined in D1.1.

  • 14.
    Osipov, Evgeny
    et al.
    Luleå University of Technology, Department of Computer Science, Electrical and Space Engineering, Computer Science.
    Riliskis, Laurynas
    Luleå University of Technology, Department of Computer Science, Electrical and Space Engineering, Computer Science.
    Eldstål-Damlin, Albin
    Burakov, Michael
    Nordberg, Mats
    Ericsson.
    Wang, Min
    Ericsson.
    An improved model of LTE random access channel2013In: 2013 IEEE 77th Vehicular Technology Conference (VTC Spring 2013): 2-5 June 2013, Dresden, Germany, Piscataway, NJ: IEEE Communications Society, 2013Conference paper (Refereed)
    Abstract [en]

    In this article, we report on a mathematical model for the throughput and delay of LTE's Random Access Channel (RACH). The model is an improvement of a cell-level Markov model of Multichannel slotted ALOHA proposed previously in the literature. The improvements concern accounting for a possibility of contention resolution in the case when terminals select same preambles and distinguishing initially-transmitting nodes from retransmitting nodes. The improved model is verified and agrees with measurements obtained from a discrete-time event-based simulator of an LTE cell

  • 15.
    Osipov, Evgeny
    et al.
    Luleå University of Technology, Department of Computer Science, Electrical and Space Engineering, Computer Science.
    Riliskis, Laurynas
    Luleå University of Technology, Department of Computer Science, Electrical and Space Engineering, Computer Science.
    Kleyko, Denis
    Luleå University of Technology, Department of Computer Science, Electrical and Space Engineering, Computer Science.
    Lyamin, Nikita
    Siberian State University of Telecommunications and Information Sciences.
    Packet-less medium access approach for dependable wireless event passing in highly noisy environments2012Report (Other academic)
    Abstract [en]

    In this article we propose the usage of binary spatter codes and distributed data representation for communicating loss and delay sensitive data in event-driven sensor and actuator networks. Using the proposed data representation technique along with the medium access control protocol the mission critical control information can be transmitted with constant delay in deployments exposing below 0 dB signal-to-noise ratio figures.

  • 16.
    Osipov, Evgeny
    et al.
    Luleå University of Technology, Department of Computer Science, Electrical and Space Engineering, Computer Science.
    Riliskis, Laurynas
    Luleå University of Technology, Department of Computer Science, Electrical and Space Engineering, Computer Science.
    Lehikoinen, Timo
    VTT Technical Research Centre of Finland, Espoo.
    Kämäräinen, Jukka
    VTT Technical Research Centre of Finland, Espoo.
    Pellinen, Marko
    VTT Technical Research Centre of Finland, Espoo.
    Simulation Based Studies of Machine-to-Machine Communications2014In: Wireless Networking for Moving Objects: Protocols, Architectures, Tools, Services and Applications, New York: Encyclopedia of Global Archaeology/Springer Verlag, 2014, p. 239-254Chapter in book (Refereed)
    Abstract [en]

    Simulations are essential for understanding complex systems such as Cyber Physical Systems. The creation of reliable multidisciplinary simulation tools that can be used to support the entire development process has been identified as a major scientific goal in several research roadmaps and agendas for the coming 15 years. This chapter presents two showcases, which highlight the necessity of trustworthy simulation tools, especially in the case of ma- chine-to-machine communications. First the performance of UWB radio technology in context of vehicle automation is evaluated. Second the experiences from performing the entire cycle of protocol development for machine-to-machine communications are presented. The two presented showcases support a conclusion that a successful simulation platform should have a us- er-friendly simulation framework and models that support virtualization. This will enable the incorporation of simulations into day-to-day engineering prac- tice and thereby shrink the gap between the real and the virtual developing environments.

  • 17.
    Riliskis, Laurynas
    Luleå University of Technology, Department of Computer Science, Electrical and Space Engineering, Computer Science.
    Methodologies and Practical Tools for Realistic Large Scale Simulations of Wireless Sensor Networks2014Doctoral thesis, comprehensive summary (Other academic)
    Abstract [en]

    Wireless Sensor Networks (WSNs) have evolved into large and complex systems and are now one of the major technologies used in Cyber-Physical Systems (CPS) and the Internet of Things (IoT).Extensive research on WSNs has led to the development of diverse solutions for all layers of software architecture, including protocol stacks for communications. For example, more than one hundred distinct medium access control protocols and fifty routing and transport-level solutions have been proposed. This multitude of solutions is due to the limited computational power and restrictions on energy consumption that must be accounted for when designing typical WSN systems. The performance of a given high-level application task may depend strongly on the specific composition of the system's protocol stack, the run-time specifics of the underlying operating system, and the potential non-deterministic behavior of the devices used in the network. This makes it very difficult to identify the optimal software architecture for any particular situation. In many cases, software components must be developed specifically for each combination of task, environment and hardware. It is therefore challenging to develop, test, and validate even small WSN applications and this process can easily consume significant resources.This dissertation investigates various approaches for making the testing and validation of large scale WSN systems more efficient. The theoretical contribution presented is a method that enables the accurate reproduction of phenomena occurring inside real sensor node hardware and software at all layers of abstraction. This will expedite the design, development, and testing of WSN functionality.The main technical contribution is a prototype of a simulation framework named Symphony, which implements the proposed method. The framework's key feature is its ability to perform ultra-large scale holistic experiments on WSN functionality with millions of nodes using configurable levels of abstraction. The behavior observable using Symphony is very similar to the run-time behavior that developers would observe in reality. This is achieved via the virtualization of real-world operating systems and by using measurement-based hardware emulation and software component models.The impact of this dissertation is twofold. First, the proposed methodology and associated development framework will facilitate the education and training of specialists in the future IoT. Second, from a more long-term perspective, the thesis paves the way to solutions for several critical problems that have been highlighted in many strategic research agendas concerning the development of future industrial systems, including the streamlined validation of equipment and service interoperability across different vendors and application domains, and the rapid integrated design of future large scale CPS.

  • 18.
    Riliskis, Laurynas
    Luleå University of Technology, Department of Computer Science, Electrical and Space Engineering, Computer Science.
    On design of dependable communication protocols for wireless sensor networks2011Licentiate thesis, comprehensive summary (Other academic)
    Abstract [en]

    This thesis considers a problem of a design of dependable communication protocols for wireless sensor networks. In life critical applications of sensor networks, for example, connected to protection of critical infrastructures or intelligent transportation system dependability (i.e. reliability, availability, security) is the key performance requirement on the underlying communication system.In most of the cases the dependability properties of the system are evaluated a posteriori, after the communication protocols have been already implemented. This approach often leads to complete redesign of the system, which makes the development cycle long and costly.The contribution of this thesis is a proposed methodology for the design of dependable communication protocols. This methodology includes modularization of the existing protocols into functional components with known reliability and security properties. Given a set of defined components the methodology suggests rules for combining them into a protocol which satisfies the dependability requirements of the particular applications. The thesis demonstrates the application of the proposed methodology on an example of a medium access protocol synthesis for two real world applications.Finally, the performance of the resulting protocol should be evaluated prior to the deployment in the real network. Here the thesis highlights the current problem of the absence of a simulation environment for accurate performance evaluation of communication protocols in wireless sensor networks. The second contribution of the thesis is an integrated simulations environment named Symphony. Symphony allows simulating the same code which runs on the real hardware. Using this simulator the development cycle could be further reduced and the obtained performance results will better match the performance of the communication system in reality.

  • 19.
    Riliskis, Laurynas
    et al.
    Luleå University of Technology, Department of Computer Science, Electrical and Space Engineering, Computer Science.
    Berdajs, Jan
    University of Ljubljana, Faculty of Computer and Information Science.
    Osipov, Evgeny
    Luleå University of Technology, Department of Computer Science, Electrical and Space Engineering, Computer Science.
    Brodnik, Andrej
    University of Ljubljana, Faculty of Computer and Information Science.
    Reality considerations when designing a TDMA-FDMA based link-layer for real-time WSN2012In: Multiple Access Communications: 5th International Workshop, MACOM 2012, Maynooth, Ireland, November 19-20, 2012. Proceedings / [ed] Boris Bellalta, Encyclopedia of Global Archaeology/Springer Verlag, 2012, p. 93-96Conference paper (Refereed)
    Abstract [en]

    In this article we elaborate on reality considerations when deploying wireless sensor networks with strict end-to-end delay requirement. Our improvements are particularly important for a design and implementation of strict real-time systems while at the same time we decrease overall power consumption. Firstly, we design and implement application tailored TDMA-FDMA medium access protocol with guaranteed end-to-end delay. Secondly, we integrate in the implementation of the protocol the bootstrapping mechanism and thirdly, the time synchronization mechanism. Next, we show that by combining medium access protocol, bootstrapping, and time synchronization mechanisms within the link-layer, we can limit on average clock drift in the network to 0.5 micro seconds, as well as achieve 81 % energy efficiency while keeping collision probability at its minimum of 1 %. Finally, we conclude with challenges and lessons learned in real-world deployment of TDMA/FDMA based link-layer with guaranteed end-to-end delay in wireless sensor networks.

  • 20.
    Riliskis, Laurynas
    et al.
    Luleå University of Technology, Department of Computer Science, Electrical and Space Engineering, Computer Science.
    Osipov, Evgeny
    Luleå University of Technology, Department of Computer Science, Electrical and Space Engineering, Computer Science.
    Coexistence of Cloud Technology and IT Infrastructure in Higher Education2013In: 2013 Frontiers in Education Conference (FIE 2013): Oklahoma City, Olöahoma, USA, 23-26 October 2013, Piscataway, NJ: IEEE Communications Society, 2013, p. 805-807Conference paper (Refereed)
    Abstract [en]

    Most of the current IT-infrastructures at Universities were designed and deployed at times of mostly campus based education, following the "one solution fits all" approach. Nowadays, with the growing number of courses given on distance and unique requirements on software content in almost every course in all disciplines the existing infrastructure became extremely stiff and inefficient. In many cases it fails providing flexible services with acceptable quality both to teachers and students. Another problem appears with the all growing mobility of students in the scope of Erasmus Mundus programme and numerous bilateral agreements between universities. The uncertainty in number of students to be handled in each semester (even in the scope of a particular course) makes it difficult for the IT departments to estimate the need and to correspondingly dimension the IT-system. Normally, IT administrations at universities over-dimension their infrastructures in order to stay competitive and provide satisfactory quality of experience. This obviously leads to an increased cost associated with purchasing and maintaining the equipment. Besides the economical component the environmental impact becomes one of the critical factors that universities have to deal with nowadays. Universities as governmental organizations need to take environmental considerations into account when implementing European Union policies on ICT sustainability. Cloud technology and specifically infrastructure as a service (IaaS) providers is an excellent alternative to an outdated inefficient local infrastructures. Early 2012 Luleå University of Technology started a project on adopting cloud technology for implementing the university's IT-infrastructure. This work-in-progress article will describe the results of its pre-study phase aiming at understanding a feasibility of integrating and/or migrating key infrastructure components into an IaaS system and opening ways for making university's resources more accessible to wider public. Numbers of logistical, technical and education related challenges, however, make such transition far from being trivial. This article focuses on the educational aspect of the pre-study. Specifically, work flows in education process of several courses in different disciplines in natural and engineering sciences were analysed from the student and teacher perspectives. In the article a schematic of a sustainable IT infrastructure adjusted to the needs of higher education will be drafted. Further, technical readiness and challenges of using cloud technology for university scale IT-infrastructure will be discussed.

  • 21.
    Riliskis, Laurynas
    et al.
    Luleå University of Technology, Department of Computer Science, Electrical and Space Engineering, Computer Science.
    Osipov, Evgeny
    Luleå University of Technology, Department of Computer Science, Electrical and Space Engineering, Computer Science.
    Introduction to component based design of dependable protocols for wireless sensor networks: modeling of MAC protocols2009In: SNCNW + Adhoc 2009: 6th Swedish National Computer Networking Workshop and 9th Scandinavian Workshop on Wireless Adhoc Networks, 2009Conference paper (Refereed)
  • 22.
    Riliskis, Laurynas
    et al.
    Luleå University of Technology, Department of Computer Science, Electrical and Space Engineering, Computer Science.
    Osipov, Evgeny
    Luleå University of Technology, Department of Computer Science, Electrical and Space Engineering, Computer Science.
    Maestro: an orchestration framework for large scale WSN simulations2014In: Sensors, ISSN 1424-8220, E-ISSN 1424-8220, Vol. 14, no 3, p. 5392-5414Article in journal (Refereed)
    Abstract [en]

    Contemporary wireless sensor networks (WSNs) have evolved into large and complex systems and are one of the main technologies used in cyber-physical systems and the Internet of Things. Extensive research on WSNs has led to the development of diverse solutions at all levels of software architecture, including protocol stacks for communications. This multitude of solutions is due to the limited computational power and restrictions on energy consumption that must be accounted for when designing typical WSN systems. It is therefore challenging to develop, test and validate even small WSN applications, and this process can easily consume significant resources. Simulations are inexpensive tools for testing, verifying and generally experimenting with new technologies in a repeatable fashion. Consequently, as the size of the systems to be tested increases, so does the need for large-scale simulations. This article describes a tool called Maestro for the automation of large-scale simulation and investigates the feasibility of using cloud computing facilities for such task. Using tools that are built into Maestro, we demonstrate a feasible approach for benchmarking cloud infrastructure in order to identify cloud Virtual Machine (VM)instances that provide an optimal balance of performance and cost for a given simulation.

  • 23.
    Riliskis, Laurynas
    et al.
    Luleå University of Technology, Department of Computer Science, Electrical and Space Engineering, Computer Science.
    Osipov, Evgeny
    Luleå University of Technology, Department of Computer Science, Electrical and Space Engineering, Computer Science.
    Symphony - simulation, emulation and virtualization framework for accurate WSN experimentation2013In: ICSE 2013: proceedings of the 2013 International Conference on Software Engineering,, New York: ACM Digital Library, 2013, p. 1-6Conference paper (Refereed)
    Abstract [en]

    We have developed a simulation framework for testing and validation of WSN applications which closely resembles processes happening inside real equipment including hardware and software induced delays. The core of the framework consists of a virtualized operating system and an emulated hardware platform integrated with a general purpose network simulator ns-3. Besides an ability of experimenting with the real code base as in the real deployments our framework allows testing the boundary effects of different hardware components on the performance of distributed applications and protocols. All in all the presented framework allows to substantially shorten the development cycle of WSN applications.

  • 24.
    Riliskis, Laurynas
    et al.
    Luleå University of Technology, Department of Computer Science, Electrical and Space Engineering, Computer Science.
    Osipov, Evgeny
    Luleå University of Technology, Department of Computer Science, Electrical and Space Engineering, Computer Science.
    Symphony: A Framework for Accurate and Holistic WSN Simulation2015In: Sensors, ISSN 1424-8220, E-ISSN 1424-8220, Vol. 15, no 3, p. 4677-4699Article in journal (Refereed)
    Abstract [en]

    Research on wireless sensor networks has progressed rapidly over the last decade, and these technologies have been widely adopted for both industrial and domestic uses. Several operating systems have been developed, along with a multitude of network protocols for all layers of the communication stack. Industrial Wireless Sensor Network (WSN) systems must satisfy strict criteria and are typically more complex and larger in scale than domestic systems. Together with the non-deterministic behavior of network hardware in real settings, this greatly complicates the debugging and testing of WSN functionality. To facilitate the testing, validation, and debugging of large-scale WSN systems, we have developed a simulation framework that accurately reproduces the processes that occur inside real equipment, including both hardware- and software-induced delays. The core of the framework consists of a virtualized operating system and an emulated hardware platform that is integrated with the general purpose network simulator ns-3. Our framework enables the user to adjust the real code base as would be done in real deployments and also to test the boundary effects of different hardware components on the performance of distributed applications and protocols. Additionally we have developed a clock emulator with several different skew models and a component that handles sensory data feeds. The new framework should substantially shorten WSN application development cycles.

  • 25.
    Riliskis, Laurynas
    et al.
    Luleå University of Technology, Department of Computer Science, Electrical and Space Engineering, Computer Science.
    Osipov, Evgeny
    Luleå University of Technology, Department of Computer Science, Electrical and Space Engineering, Computer Science.
    Birk, Wolfgang
    Luleå University of Technology, Department of Computer Science, Electrical and Space Engineering, Signals and Systems.
    A component-based approach to design and analysis of dependable MAC protocols for wireless sensor networks2009Report (Other academic)
    Abstract [en]

    This article discusses a new methodology for the systematic composition of wireless sensor networks utilizing component-based modeling of MAC protocols. The methodology is intended for the use in applications that have a predefined topology and traffic pattern while requiring dependable performance, which is typical for critical infrastructures. The need for such methodology stems from the variety of applications with different performance and dependability requirements on the one hand and unavailability of unified system architectures for sensor networks on the other. The paper suggests a work flow for the composition of protocols where the performance requirements and characteristics of the installation environment are used in the selection for components and their parametrization. It is shown how different instances of MAC protocols (known as monolithic solutions) could be achieved by different parameterizations of an abstract MAC model. For the selection of the components and parameterizations deterministic models for the communication process are suggested in order to quantify the significance of parameters and components for the performance. The quantification is expected to be achieved using concept from the areas of control structure design and performance limitations in control theory.

  • 26.
    Riliskis, Laurynas
    et al.
    Luleå University of Technology, Department of Computer Science, Electrical and Space Engineering, Computer Science.
    Osipov, Evgeny
    Luleå University of Technology, Department of Computer Science, Electrical and Space Engineering, Computer Science.
    Hostettler, Roland
    Luleå University of Technology, Department of Computer Science, Electrical and Space Engineering.
    Mäkitaavola, Henrik
    Luleå University of Technology, Department of Computer Science, Electrical and Space Engineering, Embedded Internet Systems Lab.
    Birk, Wolfgang
    Luleå University of Technology, Department of Computer Science, Electrical and Space Engineering, Signals and Systems.
    Eliasson, Jens
    Luleå University of Technology, Department of Computer Science, Electrical and Space Engineering, Embedded Internet Systems Lab.
    Enabling remote controlled road surface networks for enhanced ITS2011Conference paper (Refereed)
    Abstract [en]

    Intelligent Transportation Systems (ITS) will, in the future, play a key role to improve transportation efficiency and safety. However, cost-benefit of deploying traditional ITS is retarded by expensive equipment, infrastructure, installation and maintenance. The demo presents a replica of a real world experimental ITS application using recently proposed Road Surface Network architecture. The demonstrated "intelligent roundabout'' application is intended to warn and inform drivers about an upcoming roundabout and to prevent driving straight into collision. We show a lab prototype system consisting of: an authentic sensor node platform enabled for car detection, secure multihop communications and the running light application, a base station with system control center.

  • 27.
    Riliskis, Laurynas
    et al.
    Luleå University of Technology, Department of Computer Science, Electrical and Space Engineering, Computer Science.
    Osipov, Evgeny
    Luleå University of Technology, Department of Computer Science, Electrical and Space Engineering, Computer Science.
    Maróti, Miklós
    Bolyai Institute, University of Szeged.
    TOS-NS3: a framework for emulating wireless sensor networks in the ns3 network simulator2010Conference paper (Other academic)
  • 28.
    Wolosz, Krzysztof
    et al.
    Luleå University of Technology, Department of Computer Science, Electrical and Space Engineering, Computer Science.
    Bodin, Ulf
    Luleå University of Technology, Department of Computer Science, Electrical and Space Engineering, Computer Science.
    Riliskis, Laurynas
    Luleå University of Technology, Department of Computer Science, Electrical and Space Engineering, Computer Science.
    A measurement study for predicting throughput from LQI and RSSI2012In: Multiple Access Communications: 5th International Workshop, MACOM 2012, Maynooth, Ireland, November 19-20, 2012. Proceedings / [ed] Boris Bellalta, Heidelberg: Encyclopedia of Global Archaeology/Springer Verlag, 2012, p. 89-92Conference paper (Refereed)
    Abstract [en]

    Wireless sensor networks (WSN) commonly use ZigBee to communicate, especially when low power consumption is demanded. ZigBee may however provide unpredictable throughput although transmission distances are short. This is especially evident in difficult environments with complicated reflections and various materials through which radio signals need to pass through. Distributed scheduling based on cognitive networking principles may improve both network predictability and overall throughput. This paper presents measurements of key parameters for such cognitive scheduling, and discusses their potential for predicting suitable per-node transmission rates. Results include variability of throughput, RSSI and LQI observed for different transmission powers, transmission ranges, and number of transmitting nodes.

  • 29.
    Wolosz, Krzysztof
    et al.
    Luleå University of Technology, Department of Computer Science, Electrical and Space Engineering, Computer Science.
    Bodin, Ulf
    Luleå University of Technology, Department of Computer Science, Electrical and Space Engineering, Computer Science.
    Riliskis, Laurynas
    Luleå University of Technology, Department of Computer Science, Electrical and Space Engineering, Computer Science.
    A measurement study of predicting throughput from LQI and RSSI2012Report (Other academic)
    Abstract [en]

    Wireless sensor networks (WSN) commonly use ZigBee tocommunicate, especially when low power consumption is demanded. Zig-Bee may however provide unpredictable throughput although transmis-sion distances are short. This is especially evident in difficult environ-ments with complicated reflections and various materials through whichradio signals need to pass through. Distributed scheduling based on cog-nitive networking principles may improve both network predictabilityand overall throughput. This paper presents measurements of key pa-rameters for such cognitive scheduling, and discusses their potential forpredicting suitable per-node transmission rates. Results include variabil-ity of throughput, RSSI and LQI observed for different transmission pow-ers, transmission ranges, and number of transmitting nodes.

1 - 29 of 29
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